Irwin 12413 3/4″ High Speed Steel Black Oxide Countersink Drill Bit

The Irwin 12413 3/4″ High Speed Steel Countersink Drill Bit is designed for creating clean, accurate countersunk holes in a wide range of machinable materials. Manufactured from industrial-grade high speed steel, this countersink is built for durability and consistent cutting performance in demanding shop and jobsite environments. The 3/4-inch diameter is well suited for larger flat-head fasteners where increased seating area and precise alignment are required.

This countersink features a precision ground 82-degree cutting angle, which matches the standard profile used for most flat-head screws in metal, wood, and plastic applications. Its five-flute design helps minimize vibration during operation, resulting in smoother cuts and improved control, especially in harder materials. A black oxide finish provides added corrosion resistance while reducing friction during cutting. With a 1-13/16-inch overall length and a 1/4-inch round shank, the Irwin 12413 is compatible with most handheld drills and drill presses for flexible use across multiple work setups.

Irwin 3/4″ High Speed Steel Black Oxide Countersink Drill Bit At a Glance

• 3/4″ Countersink Diameter: Designed for larger flat-head fasteners and hardware
• 82° Cutting Angle: Matches standard fastener angles for flush seating
• High Speed Steel Construction: Built for durability and reliable cutting performance
• Five-Flute Design: Reduces vibration and chatter for smoother operation
• Black Oxide Finish: Improves corrosion resistance and cutting efficiency
• 1/4″ Round Shank: Fits most handheld drills and drill presses
• Precision Ground Cutting Edges: Delivers clean, repeatable countersinks

Markets

• Metal Fabrication Shops: Used for countersinking fasteners in steel, aluminum, and soft metals
• Construction and Renovation: Suitable for hardware installation and heavy fastening tasks
• Woodworking and Cabinet Shops: Provides clean countersinks in hardwoods, softwoods, and panels
• Automotive and Equipment Repair: Supports flush fastener installation on brackets and assemblies
• Maintenance and Facility Services: Useful for repair and retrofit work across mixed materials
• Trade Schools and Educational Programs: Helps demonstrate proper countersinking techniques

Professionals working with larger fasteners need consistent countersinking to ensure proper fit and a clean finished surface. The Irwin 12413 countersink drill bit is designed to handle these applications by delivering smooth, controlled cuts across metal, wood, and plastic. Its precision ground 82-degree cutting angle helps fasteners seat flush, reducing alignment issues and minimizing rework.

The five-flute cutting geometry improves stability during operation, which is especially beneficial when countersinking harder materials or thicker stock. With a 1/4-inch round shank that works with standard drills and drill presses, this countersink integrates easily into existing tool setups. From fabrication shops to maintenance departments, it offers dependable performance for everyday fastening preparation.

Irwin 12413 3/4″ High Speed Steel Black Oxide Countersink Drill Bit Features

• Industrial-Grade High Speed Steel: Provides strength and wear resistance for repeated use
• Precision Ground 82° Tip: Designed for standard flat-head fastener applications
• Five-Flute Cutting Geometry: Reduces vibration and improves cut quality
• Black Oxide Coating: Helps resist corrosion and reduce friction during cutting
• Machinable Material Compatibility: Suitable for iron, steel, soft metals, plastics, and wood

Irwin 12413 3/4″ High Speed Steel Black Oxide Countersink Drill Bit Includes

• (1) 3/4″ High Speed Steel Countersink Drill Bit

Irwin 12413 3/4″ High Speed Steel Black Oxide Countersink Drill Bit Specifications

• Diameter: 3/4 in.
• Cutting Angle: 82 Degrees
• Overall Length: 1-13/16 in.
• Shank Size: 1/4 in.
• Shank Type: Round
• Material: High Speed Steel
• Finish: Black Oxide

Why Customers Choose the Irwin 3/4″ High Speed Steel Black Oxide Countersink Drill Bit

Customers choose the Irwin 12413 countersink drill bit when applications call for reliable countersinking of larger flat-head fasteners. The high speed steel construction provides long-term durability, while the black oxide finish helps maintain performance in shop and jobsite conditions. Its 82-degree cutting angle aligns with common fastener standards, helping installers achieve consistent, flush results.

The five-flute design reduces vibration and improves control, which is especially important when working with thicker materials or harder metals. With a 1/4-inch round shank that fits standard drills, this countersink is a practical choice for contractors, fabricators, and maintenance crews who need accurate, repeatable results across a range of fastening tasks.